Solder.



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Patented Apr... ML, Twit.

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1,093,4d3. Specification of Letters Patent.

No Drawing.

Application filed April 18, 1913 Serial No. 762,013.

To all whom it may concern.

Be it known that I, CHARLES F. GRIMM, a

citizen of the United States, residing at Le Boy, in the county of Mower and State of Minnesota, have invented certain new and useful Improvements in Solder; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art .to which it appertains to make and use the same.

This invention relates to a solder which is especially adapted for soldering aluminum.

The object of the invention is to provide a cheaply constructed solder which will not form a tight waterproof joint.

Another object of the invention is to pro- .come off after once being applied andwfll vide a solder which can be applied to the aluminum while the aluminum is'cold and which is designed for connecting or soldering aluminum to other metals such as tin, copper, brass and the like, or such metals to each other.

This improved solder is composed of zinc,

tin and lead preferably combined 'inthe' following proportions, to wit: 25% zinc, 50% tin, 25% lead. These ingredients in the proportions above specified are placed in a ladle or pot-anil the entire mixture heated to a red heat at which point the alloys will completely fuse. The melted mass is then poured into a mold or molds of the desired then heated and size to form sticks of solder and it is allowed to. coolin said molds. The aluminum to be soldered is placed in the desired position, the surface thereof. to which the solder is tobe applied having first been cleaned if necessary. An ordinary soldering iron is in contact therewith and at once melts and follows the joint or hole which-is to .be solderedand this solder it has been found will solder yet it is not not crack or check and produces a solid ti ht'joint.

V V'lnle the. proportions specified above have been found to dproduce a satisfactory some of this solder is placed esiredto limit the in-- vention thereto as mined in 0th well. For mstance, seven parts of tin, two parts of zinc and one part of lead may be combined-and form a very satisfactory, emcient solder, also eight parts of tin, two parts of lead and two parts of zinc it has been found will solder tin, copper, brass, aluminum and will solder either of these metals together and will also act when a flux or acid is employed upon the metals except upon aluminum which should have no acid or .flux used in connection therewith because of corrosion.

The use oflead in solder renders it strong and causes it to hold the heat and thus adapts it for use with a soldering iron alone without heating either the solder or the article to which it is to be applied. It has also been found that a solder consisting of tin, zinc and lead will attackeach other almost equally when a well heated soldering iron is 7 each 0 the metals to be soldered. The lead in the solder holds the heat and retains the er proportions and operate equally laced simultaneously in contact with tin and zinc in an adhesive condition when applied upon aluminum while zinc and tin alonewill set hard at-once and have. less effect upon .the resisting surface of the aluminum. A tin and zinc solder'is brittle and will not stand bending and cannot be employed with a .solderin iron alone as it hardens the moment it tOllfilQS the aluminum and this necessitates the heating of the aluminum.

- I claim as my invention:

A solder composed of zinc twen Jive per cent, tin fifty per cent, and lea twentyfive-perv cent.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses. I

- CHARLES F. GRIMM.

Witnesses: v

' H. GJCmrmn,

, Bowers, i 

